In a nutshell, carbon fiber wrapped barrels are mostly about aesthetics and very little else. That's not to say they're a bad barrel, but there just is very little, if anything, better about them than a equal quality all steel barrel. It's been debunked multiple times that they do not cool any faster than a all steel barrel, regardless of the resin used or the winding process. Recently there was, yet another, independent test done that debunked their claim to being stiffer, so when you boil all the marketing BS off, what you're left with is aesthetics and "cool factor". Some people, myself included, like how they look and I'd be lying if I didn't admit I think they look pretty cool. I recently put a 6.5CM Proof CF barrel on my Seekins SP10, but it wasn't because I thought it was a better barrel than any number of custom all steel barrels I could have used and would have cost me much less, no it was strictly because I liked how it looked and I think if most people who purchase CF wrapped barrels were completely honest, they'd admit the same. Either that, or they got swept up in the marketing and actually believe there is something truly better about them. As for lightness, the biggest place they lighten things, is in your wallet.